Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. Which of the following gases do not form part of the atmosphere? Nitrogen Chlorine Oxygen Carbon idoxide None 2. Which of the following gases burns in air Nitrogen Carbon monoxide Carbon dioxide Helium None 3. The percentage of nitrogen and oxygen in air is: 21% by volume 37% by weight 99% by volume 50% by weight None 4. Choose the option which justifies the given statement:-Air is considered a mixture, not a compound. It is possible to separate air into its constituent gases by physical methods like fractional distillation. Air shows properties same as the constituent gases present in it. Air does not have a fixed formula like compounds. All of the above None 5. Which one of the following gas does not form a part of the atmosphere? Nitrogen Carbon dioxide Oxygen Chlorine None 6. __________ is the most abundant gas in the atmosphere. Nitrogen Carbon dioxide None of the above Oxygen None 7. What is the major constituent of air Water vapour Hydrogen Nitrogen Oxygen None 8. Carbon exists in the atmosphere in the form of: carbon monoxide in traces and carbon dioxide carbon monoxide only coal carbon dioxide only None 9. Air has________ composition with________ oxygen at high attitudes. fixed, more variable, more fixed, less variable, less None 10. Air is regarded as a mixture because: its temperature may change its volume changes under different conditions its pressure may vary its composition may vary None 11. What process replenishes the atmosphere with oxygen? Both A and C Photosynthesis Oxygen Cycle Water Cycle None 12. The correct ascending order of gases as per their composition in air is: oxygen < carbon dioxide < hydrogen oxygen < carbon dioxide < nitrogen hydrogen < oxygen < nitrogen nitrogen < hydrogen < oxygen None 13. John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make? Air is matter Air has mass Air is a gas. Air occupies space None 14. Which of these statements are true about air?(i) Air is a mixture of several types of gases.(ii) Air exerts pressure.(iii) The composition of air is constant in the atmosphere. (i) and (iii) (ii) and (iii) (i), (ii) and (iii) (i) and (ii) None 15. Which is the most abundant gas in our atmosphere ? Nitrogen Carbon dioxide Oxygen Carbon monoxide None 16. A greenhouse gas that absorbs energy and maintains earth's temperature is: nitrogen oxygen argon carbon dioxide None 17. Carbon dioxide constitutes nearly ___ % of the atmosphere. 78 45 0.03 28 None 18. Glass panes usually appear hazy because: None it is the property of transparent substances water vapour settling on the tiny dust particles. they are old. None 19. It is not proper to breathe through our mouth because: our throat will become sore more carbon dioxide will be inhaled we will catch cold easily the dust particles would enter our bodies None 20. Combustion can not take place without: Air water carbon zinc None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
